read the USB flash disk(CB86-PLUS) --> please format if you can access it

copy the new doc to CB86 flash disk --> CB86-PLUS-V2-3Stable.mac

pull out USB

finish upgrading.

After success upgrade, when its power on, you will get message "input voltage is too low".

For this error, you need to re-callibration the CB86. Step by step for callibration like below:

Connect battery at port 4 like picture and power supply at charger input. Connect multimeter too at charger input for reference.

Enter the calibration mode: press the "START" and "SET" key in the same time into the calibration interface, then POWER ON

Select the calibration item: press “SET” to change calibration item, the screen light will change between power supply voltage and the battery voltage

Calibrate Power supply voltage :when screen light at Power supply voltage item, use multimeter to measure power supply voltage, press “+，-” adjust the voltage of BC86, in order to the voltage it same as multimeter’s voltage.